Cloudflare IPs blocked by T-MOBILE PL

Website, Application, Performance DNS & Network
2

I join the problem. Previously we struggled with this two months ago, the problem suddenly stopped (I thought by turning on AGRO). Since yesterday, it has been blowing up all pages directed by Cloudflare from t-mobile internet in Poland (tested from different SIM cards in 2 cities Szczecin and Poznan). AGRO is not helping, only pulling in cash.

Since we have two main domains and a test domain, and Cloudflare decided to charge us the PRO plan package when we were on FREE all the time (not bad there). I decided to take advantage of the money already pulled in and switch to PRO for testing on the main domain.

I tracked the web traffic of both domains and got interesting results:
Domain on PRO plan

  1. the network goes out from our IP
  2. we jump a few times in Germany (Deutsche Telekom, NTT, Frankfurt)
  3. we hit Cloduflare, Frankfurt, Germany, and then the end server.
  4. average response time: 77.286 ms

For the FREE plan:

  1. the network goes out from our IP
  2. we jump a few times in Germany (Deutsche Telekom)
  3. we fly ourselves to New York (NTT, Newark, USA)
  4. we hit Cloduflare, New York, USA, and then the end server.
  5. average response time: 158.413 ms

To summarize:

  1. In the case of the main domain on the PRO plan, the route stays in Europe (mainly Germany) and ends up on Cloudflare servers in Europe (Frankfurt).
  2. In the case of the domain where we test the application on the FREE plan, the route goes through Germany, but then the packets jump across the ocean to the US (Newark, New York).

// Quick update - while writing this reply, the test domain started working. On the other hand, we are not happy with this information, because within 48h once it works and once it stops working.

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